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Wed, 9 Jul 2025 22:59:46 -0700 From: Nicolin Chen To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v9 01/29] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova_range Date: Wed, 9 Jul 2025 22:58:53 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000144:EE_|DS7PR12MB6214:EE_ X-MS-Office365-Filtering-Correlation-Id: 2a82a150-62f5-4a02-cbc5-08ddbf770181 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?b/zM/HywbG360pl8CfeIVuCC5S8BoftrdTi12KwWGUeNvORr4mInB4uItsQq?= =?us-ascii?Q?3HuDCm7g+//U7F3nn4NU/1lc96GA60L1qkwUx1ZyIFFDASexB0vf+Gb3T+xt?= =?us-ascii?Q?WO1WWT8PCH3zJLocixv+XEWsFAMbBTpB0vc6j14MIiHiFRZrqfimhQllwJZl?= =?us-ascii?Q?RVktmlgJ9k47heBvzeZfK3XZpTqBtg+aXPdyszLCqv+wj8Y3mvVaD8J/0ZiJ?= =?us-ascii?Q?x5M4/jR12XjBPCPlKWMEih0mmqi5daQhXP/+etAybcsV1n0q4Vc3Zc1t2eCy?= =?us-ascii?Q?ZZHdYcd/o44pGVrOyvKIg6suxaHg2jDqLPTfMqHtNAqpdVO/9mz065MzRHg9?= =?us-ascii?Q?UJ7hUsAD2RvNcT0j+j9aUbANY/rWx6u+gALKmRdNc2aKGdo4+b8kZ1UNr4fi?= =?us-ascii?Q?E/syfYo4/1t9SrHdSxSs1pOHDHprM0t4NnVJDMWL+M+gHE6xBFbg1gov3amL?= =?us-ascii?Q?PDMz5QeD3l+xvry1fkFkTKj1qyuN8JD2SgboDmXahYnK3qYUyFEVcpad87JX?= =?us-ascii?Q?Fhr7Nrta+mG//AbieMJt2rIrNEZM4Rix8sQMWBJxensCtmii1HAYrRgaqsWE?= =?us-ascii?Q?rRuGfjUlRoTVbdJE01hrlysOKQckaa/SyyT5VHckQxxiPRx0Fa7ajuLXtSx2?= =?us-ascii?Q?PKHwgYITwi8o0MdF2jOVzdWsuZEvV5c0p38IVuznjvgWyEKd6wNGgPrl5IJD?= =?us-ascii?Q?+CIck0ofCU7n35oNMakn0D9s3fXmGeG8iEd1CA+GeLn7vfsw5jDtu0g3po+I?= =?us-ascii?Q?Jk9xxAVXkK7hR+DsgFmEcZ49uoLXEx2QNDZjeq07taZTOVAjfVnW1ZYsMNGt?= =?us-ascii?Q?dojTkpUwUmpFzKnX8M16Sk5JPFQ/qFDaxfvIhrKkJNDtD/z3Ujp4Sh3BEkQ/?= =?us-ascii?Q?5pr5N4kP6JGS0lnv9crr37FiB99W9QXK8Wv8k3EMJ58cNcc5HdJLkT0MbafT?= =?us-ascii?Q?w+0UYZ3ptKMqTHk+r9olo/K9OQge812gHNwwiNSU9XUkA+HeTs+6riq1qvqd?= =?us-ascii?Q?fUOEvHuksUx1WymbnXkcy8Ou+fpJSHBc3lHcPIqR4BMlWyDPE37DWLBSwquV?= =?us-ascii?Q?uQyqbEYfgLwhAqGVIaclSTMmLCzYU/ynCmF+y8RjtG2Pru6GWS1gnWWPkHwc?= =?us-ascii?Q?d41IToQVoXFMyYAm4kbVeqaq/ZDFiUvVe3p7tU1gRT0vogRuQBSg54kf+HsC?= =?us-ascii?Q?YNl45QADhlzeQD9frS+6P2TVEd00cn2HSUzE6KZE2qjlKoNmHkiXzKScWikR?= =?us-ascii?Q?/ZJdV4BmSdVfHDzsGbfif8ryLFvx95VBWI7z78mYdkNpl8COxYZuU7GM1/lX?= =?us-ascii?Q?ROrzalvcaX0VjXPckpYxYkQ5sdCz4n+Zd8BqHd3BAmTMQbs4cba2iZVnQvFm?= =?us-ascii?Q?Pv8drjJ/tRSdkSn4iWzWl7o0/P9haxvVd8znB81IIhS2BKbH4fnv3O1FWulc?= =?us-ascii?Q?s/xuFuiGce00GOEbee1xmdXeqcGRhpilVGs00/tjkZCW/b8AEuyQz+aJrwqY?= =?us-ascii?Q?6pEf/bdyjFNWurgjHPG8Hu+FAaAk3nIRUE3u?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jul 2025 06:00:00.2254 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2a82a150-62f5-4a02-cbc5-08ddbf770181 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000144.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6214 There are callers that read the unmapped bytes even when rc != 0. Thus, do not forget to report it in the error path too. Fixes: 8d40205f6093 ("iommufd: Add kAPI toward external drivers for kernel access") Cc: stable@vger.kernel.org Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/io_pagetable.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/iommufd/io_pagetable.c b/drivers/iommu/iommufd/io_pagetable.c index 13d010f19ed1..22fc3a12109f 100644 --- a/drivers/iommu/iommufd/io_pagetable.c +++ b/drivers/iommu/iommufd/io_pagetable.c @@ -743,8 +743,10 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start, iommufd_access_notify_unmap(iopt, area_first, length); /* Something is not responding to unmap requests. */ tries++; - if (WARN_ON(tries > 100)) - return -EDEADLOCK; + if (WARN_ON(tries > 100)) { + rc = -EDEADLOCK; + goto out_unmapped; + } goto again; } @@ -766,6 +768,7 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start, out_unlock_iova: up_write(&iopt->iova_rwsem); up_read(&iopt->domains_rwsem); +out_unmapped: if (unmapped) *unmapped = unmapped_bytes; return rc; -- 2.43.0